docs: add badges to README, update various URLs

And remove reference to inaccessible video

Change-Id: I3ea826ac393847226d760002d700ae1ee648ff71
diff --git a/docs/videos.rst b/docs/videos.rst
index db97952..0783f21 100644
--- a/docs/videos.rst
+++ b/docs/videos.rst
@@ -3,16 +3,20 @@
 
 May be outdated since version 0.5.0.
 
+Mini-NDN Demo at ACM ICN 2017
+-----------------------------
+
 .. raw:: html
 
-    <div id="video-container" class="col-md-6 ">
-        <p>Mini-NDN Demo at ACM, 2017</p>
-         <iframe width="400" height="230" src="https://www.youtube.com/embed/xYRPHZe18o0" frameborder="0" allowfullscreen=""></iframe>
+    <div id="video-container" class="col-md-6">
+    <iframe width="560" height="315" src="https://www.youtube-nocookie.com/embed/xYRPHZe18o0" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>
     </div>
 
+Mini-NDN Overview
+-----------------
+
 .. raw:: html
 
-    <div id="video-container" class="col-md-6 "">
-        <p>Mini-NDN Overview </p>
-         <iframe width="400" height="230" src="https://www.youtube.com/embed/Da7t8yBWzv0" frameborder="0" allowfullscreen=""> 
+    <div id="video-container" class="col-md-6">
+    <iframe width="560" height="315" src="https://www.youtube-nocookie.com/embed/Da7t8yBWzv0" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>
     </div>